Baffling for water-tube steam boilers



May 7, 1929. G. c. VENNUM BAFFLING FOR WATER TUBE STEAM BOILERS Filed Sept. 15, 1924 3 sheets-shet May 7, 1929. G. c. VENNUM BAFFLING FOR WATER TUBE STEAM BOILERS Filed Sept. 15, 1924 5 Sheets-Sheet May 7, 1929, G. c. VENNUM BAFFLING FOR WATER TUBE STEAM BOILERS Filed Sept; 15, 1924 3 Sheets-Sheet 1 z /I 0/ /I 1 Patented May 7, 1929.

I 1,7ll,622

UNITED STATES PATEZNT OFFICE.

GEORGE CARL VENNUM, OF WILMINGTON', DELAWABE, ASSIGNOR TO EDGE MOOE IEON COMPANY, OF EDGE MOOR, DELAWARE, A COREORATION OI' DELAWABE.

-BAFFLING ron WATER-'ruan emmm BOILEBS;

Application filed September 15, 1924. Serial No. ?87,751.

My invention' relates to the class of water tube steam boilers in which a wide bank of Water tubes connected at top and bottom by drums o'r sectional headers lies directly in 6 the path of the furnace gases and, more particularly, my invention relates to boiler-s of the type described in my pendng application filed July 2, 1921, Serial No. 482,086,

Patent No; 1,618,141. The object of my in-.

10 vention is to provide a simple and eiiicent means by which at the same time a down flow of water is brought about in the rear tubes of the tube bank at points intermediate its ends, and the path of the heating gases s sufliciently'contracted as they pass through the tube bank and impart heat thereto, to maintain a proper speed of flow throughout the thickness of the tube bank.

The nature of my imprvements will be best understoqd as described in connection with the drawings in which they are llustrated and in which V Figure 1 is a side elevation of a boiler constructed in general accord with that de- 2 scribed in my aforesaid ap lication.

Figure 2 is a horizonta section on the line 2-2 of Fig. 1. t

Figure 3, across section of the tube bank on the line 3-3 of Fig. 1.

Figure 4 is a View generally similar to Fig. 1, but showing the tube bank united at top and bottom with sectional headers so as to form the tube bank of a series of separable units.

Figure 5 is a cross section on the line 5-5 of Fig. 4, and

Figure 6, a :fragmentary viewillustratingthe'construetion and mode of uniting the A separable headers of the different ends of 40 the boiler.

Fig'ure 7 is a fragmentary front view showing the upper headers of Fig. 4, the tubes and bathe plates. i

Figure 8 is a perspective view illustrating the Construction of a baflle plate shown in Fig. 3, and

Figure 9 is a persp'ective View illustrati'ng %ie Construction of the baflle plate shown in is the furnace. B, B, etc., water tubes extending in a wide bank across the top of the furnace and united at top and bottom to headers which may be the drums, as in dicated at B', B in F 1, or sectional headers as indicated at b' in Fig. 4. C is the steam and water drum of the boiler. united to the upper header or headers by a pipe -C' and a lower header or headers b a' pipe C 'D, D', indicate the tubes o a superheater connected at their bottom by headers D connected at top by a pipe D with the steam space of the drum C. E indicates the water tubes of the water heating section of the boiler. These are con-` nected in series by means of'headers indicated at E' and are connected with the steam and water drum C by a pipe E This water heating section of the boiler is made up of progressively shorter rows of tubes enclosed in a 'contracting flue indicated at E". At D D I have indicated dampers 'in the superheater. y

G, G, are baifle plates which, as shown in Fig. 3, may extend an ularly through thespace between some of t e rear tubes of the tube bank B, so as to protect certain of the rear tubes from direct contactwith the furnace gases, and also so as to form a series of contracted passages through the rear tubes. G', G', in Fig. 5, illustrate an alter- 0 native disposition of. the baflle plates in which, instead of extending into the space between the rear tubes, the baflie plates are simply located at the rear of the tube bank.

In both cases the baflle plates which extend,

of course, parallel with the tubes, are symmetrically disposed and in the eonstruction shown in Fig. 5, while groups of the rear tubes are not physically protected from contact with the furnace gases, the flow of the gases through the space between the baflles directly results in the bulk of the gases ass ing the tubes immediately in front o the bafle's with but little or no contact therewit It is obvious, of course, that the baflles disposed as described will result in an in creased speed of flow of gas through the rear portion of the tube bank and also it will be obvious that the rear roups of tubes protected from contact with or full contact with the gases will serve for the down-flow of water and will cause this down-flow to take place throughout the length of the tube bank, thus greatly relieving the headers into which the-tubes open which may be much smaller than where the bulk of the water has to flow through the ends of the headers before it finds a path for down-flow.

Where sectional headers are used, as

shown'in Figs. 4, 5 and 6,baffle plates are provided for each of the units consisting of a group of tubes and connecting headers and little or no flow occurs' from header to header in either direction. 'I have provided nipples at b to permit such flow as mayoccur.

Having now described my invention, what I claim as new, and desre to secure by Letters Patent,. is:

' 1. In combinaton with a steam boiler having substaitially straight top and bottom headers connected by a wide and deep bank of water tubcs extending across a single pass for furnace gases, means for contracting the flow of gases through the tube bank and for promotng downfiow of water inspaced groups of tubes at thesrear of the tube bank and being of such breadth and.

so disposed as to extend over groups of three or more tubes and keep some of them out of the path of the furnace gases.

W 2. In combination with a steam boiler having a substantially straight wide and deep bank of water tubes extending across a single pass forfurnace gases and made up of connected units each unit comprising an upper and lower sectional header connected by a tube bank, said headers being connected together laterally by conduits of restricted area, means for contracting the flow of gases through the wide tube bank and for promoting down flow of water through rear tubes of each scctional unit consistng of baflie plates of less width than the tube bank of the unit extending parallel to the tubes at the rear of each unit and substantially throughout the length of said tubes said baflie plates being of such width as to eX- tend over groups of three or more of said rear tubes so as to keep some of the rear tubes of each unit out of the path of the heating gases.

GEORGE CARL VENNUM. 

